7x-3y=15 is the equation in standard form.
So lets add the common fractions 3/4+3/4+1/4+1/2=7/4+1/2=18/8, now the whole numbers 3+1+2+4+2=12, so 12 18/8 and simplify 14 2/8= 14 1/4 <span />
The sum of the angles should equal 180
so, x = 50
now you plug it in. 2(50) -30
m=70
The values are 
The quadratic function, expressed in factored form is

Expanding and simplifying

since

we can equate coefficients of like-terms and conclude that

Learn more about quadratic equations here: brainly.com/question/12995618
Answer:
D
Step-by-step explanation:
since there is no whole fraction for the 0.4 so it has to be a repeated decimal so i picked D.